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Showing 1 to 20 of 20 for “"Sorption kinetics"”.
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Multiscale modeling and numerics of sorption kinetics
L'obiettivo della tesi è quello di sviluppare modelli multiscala e metodi numerici per la simulazione di surfattanti (anioni e cationi) in presenza di una bolla oscillante che si comporta come una trappola per gli anioni E' un problema interdisciplinare e la trattazione è approfondita …
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Polycyclic aromatic hydrocarbon sorption kinetics in three iron oxide-coated aquifer sands
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Reaction condition effects on Re(VII) sorption kinetics at the zerovalent iron-water interface
… analogue for 99Tc(VII)O4-, batch Re(VII) sorption experiments were conducted in ZVI as a function of pH (8.2-10.2) and nitrate concentration (0-0.1M). Zero valent iron was effective in reducing Re(VII) to Re(IV), and the initial (< few hrs.) Re sorption was rapid at the ZVI-water interface …
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Adsorption kinetics for the removal of soluble manganese by oxide- coated filter media
This study was conducted to examine the kinetics of manganese sorption on oxide-coated filter media. Initial experimentation confirmed the findings of other investigators, the Mn²⁺ sorption capacity of oxide-coated media increases as solution pH increases. Further study revealed that uptake rate …
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Nanoscale magnesium as a hydrogen storage material
… of the samples was confirmed using XRD. Sorption enthalpies of the films were calculated through van’t Hoff plots and were found to be quite high. However, the 40 layer Mg/Ti sample displayed the lowest enthalpy of all (due to the cooperative phenomena). Studies on sorption kinetics …
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Organic-inorganic hybrid materials for arsenic adsorption : surface complexation and intraparticle diffusion
… AT AUTHOR'S REQUEST.] Arsenic removal through adsorption is one of the most widely applied techniques for arsenic removal from drinking water. Among the numerous arsenic adsorbents that have been developed, organic-inorganic hybrid materials are promising candidates due to the merits of their …
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Sorption and Biodegradation of Organic Solutes Undergoing Transport in Laboratory-scale and Field-scale Heterogeneous Porous Media.
… first study focused on the magnitude and rate of sorption of hydrophobic organic compounds by two, well-characterized soils. The composition of organic matter had a small effect on the magnitude of the organic carbon normalized equilibrium distribution coefficients. The sorbates sorbed more …
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Design of anion exchange cellulose hydrogel for large proteins
… morphology were correlated with transport and sorption kinetics. The kinetic characteristics clearly defined a minimum of two different types of protein binding site architecture. DEAE cellulose beads exhibited molecular exclusion of BSA near the edge of the bead in contrast to greater …
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Microplastics as Contaminant Vectors: Influencing the Bioaccessibility of Naphthalene from Freshwater
… tract (GIT). The focus was on characterizing the sorption mechanisms of naphthalene and its bioaccessibility (i.e., an estimate of the fraction of an ingested dose that becomes soluble in gastro-intestinal fluids). Three types of MPs, medium-density polyethylene (MDPE), polypropylene (PP), and …
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Gravimetric, neutron scattering and computational studies of the sorption and diffusion of gases in zeolites
… Gravimetry has been used to study the adsorption and desorption of water on Na zeolite Y in the temperature range 100-190°C. Significant hysteresis was observed in all cases, probably caused by the movement of cations away from their original positions. The sorption kinetics were …
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Development of CaO-based Sorbents for Post-Combustion Carbon Capture in the Calcium Looping Process
… price, high theoretical uptake capacity, fast sorption kinetics, and high-temperature operation are some of the advantages of the calcium looping process. Despite the promising attributes of the process, a main barrier for commercialization of the process is the loss of the uptake capacity of …
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Characteristics and mechanisms of atrazine sorption to biochar for land remediation
… of 550°C and 700°C (excluding OSR at 700°C). The sorption mechanisms controlling atrazine sorption to these biochars were determined through various characterisation methods and batch sorption experiments. The sorption tests showed that sorption to each of the standard biochars occurs via multiple …
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Sorption-based atmospheric water harvesting: from atoms to applications
… anywhere on the earth, and available to anyone. Sorption-based atmospheric water harvesting (SAWH) is the extraction of water vapor using sorbent materials across a broad spectrum of relative humidity, which opens new avenues to address water scarcity faced by two-thirds of the world’s …
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Aqueous and solid phase interactions of radionuclides with organic complexing agents
… In this work, radionuclide speciation and sorption behaviour were investigated in order to identify interactions between four key radionuclides with different oxidation states (Cs(I) and Sr(II) as important fission products; Th(IV) and U(VI) as representative actinides), three anthropogenic …
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Transport and sorption phenomena in concrete and other porous media
… and the remaining papers and reports deal with absorption and physical properties related to adsorption for different materials. The fourteen contributions have the following contents: <br> RI:1, Diffusion of a mixture of positively and negatively charged ions in pore solution of concrete is …
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Determining the spatial and temporal distribution of macro- and microplastics in soil and their impact on soil function.
… share a common anthropogenic source. Further, sorption and desorption kinetics of 16 priority polycyclic aromatic hydrocarbons (PAHs) were investigated using two different sizes of polyethylene microfilms derived from mulch film mixed into an agricultural soil. Sorption data fitted a first …
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Electrochemical energy conversion using metal hydrides hydrogen storage materials
… activation, electrochemical activity and H2 sorption kinetics of the MH alloys. Between the two catalysts the one which displayed better performance was chosen. The materials were characterized by X-ray difractommetry, and the alloys presented hexagonal CaCu 5–type structure of symmetry …
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Direct 3D and in situ characterization of light metal hydrides for hydrogen storage
… but sluggish hydrogen uptake and release kinetics hinder their practical use. Significant improvements in the kinetics of these materials have been achieved with catalytic additives in conjunction with nano-structuring via high-energy ball-milling or by infiltration into mesoporous …
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The mobility of endosulfan and chlorpyrifos in the soils of the Hex River Valley
… was performed on the samples including pesticide sorption experiments in which gas chromatography coupled with electron capture detection and flame photometric detection were employed. The Hex River Valley is a sensitive area because of the intensive agricultural activities and high vulnerability …
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Transport and adsorption-desorption of heavy metals in different soils
… kinetic experiments were performed to assess the sorption-desorption and mobility of Cd, Cu, Pb, and Sn in alkaline and acidic soils. Furthermore, sequential extractions were accomplished to examine their behavior in soils. Also, the competitive reactivity of Sn and Pb in two acidic soils was …